(“It’s pHantastic!”)
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pH measures __________________________________
The pH of water is _______________
Draw 2 water molecules and show the hydrogen
bond.
Draw a hydronium ion and show its formula.
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pH means the _____________ of hydrogen
pH could also be the amount of ______________
or the amount of _________________ inside the
water.
The chance of finding a hydronium ion in
distilled (pure) water is 1 in ___________________.
◦ Now, write that in decimal form: 0.
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Write the equation for pH:
pH =
What is the pH of an aqueous solution that has
a concentration of 0.00001 hydronium ions?
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An acid found in your stomach is _______________.
If we put that acid in water it ___________________
to form _______ions and _______________ ions.
The concentration of hydronium ions for this acid
is as high as 1 in ________.
So, its pH is __________.
An example of a base is ___________.
When we put it into water it dissociates to form
________ions and _____________ions.
◦ What happens to the H+ ion concentration? Why?
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pH measures the amount of __________________
Draw a diagram that shows the pH scale from 0 to
14. Label it with three words: acid, base, neutral.
The pH of the oceans over the past couple
hundred years is (increasing or
decreasing).
 Why is the pH changing?
 How is this related to mass extinctions in
the past?
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Given [H+], take the –log of that [H+].
1. Easy example:
pH of a solution with [H+] = 1 x 10-8M
pH = -log of the [H+]
= -log (1 x 10-8)
= -(-8)
=8
2. More difficult example:
pH of a solution with [H+] = 5.21 x 10-2M
pH = -log of the [H+]
= -log (5.21 x 10-2)
= -(-1.283)
= 1.283
pH + pOH = 14
When given pH, just subtract
from 14 to get the pOH.
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Blood
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Distilled water
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Milk
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Stomach juice
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Ocean water
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Gasoline
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Ketchup
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Sweat
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Windex
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Saliva
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Drano
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Rainwater
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Orange juice
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Pool water
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Lye
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Lake water
Example:
Blood 7.35